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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating activities:    
Net loss $ (994) $ (862)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized gain on derivative instruments (3) (66)
Depreciation and amortization 7 14
Loss on equity method investment 313 109
Gain on warrant liability (99)   
Employee stock option expense 125 174
Deferred income tax benefit (169) (109)
Amortization of discount on long-term debt    53
Property abandonment and impairment 10   
(Gain) on asset and equity security sales    (332)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (14) 239
Accounts payable and other current liabilities 33 (111)
Net cash used in operating activities (791) (891)
Investing activities:    
Additions to mineral properties (362) (335)
Additions to other assets    (9)
Proceeds from mineral property sale receivable 4,000   
Proceeds from sale of marketable equity securities    353
Net cash provided by investing activities 3,638 9
Financing activities:    
Short-term borrowing (net)    787
Proceeds from exercise of options 183   
Noncontrolling interest contribution, net    50
Proceeds from long-term debt 1,000   
Payment to noncontrolling interest (250) (150)
Net cash provided by financing activities 933 687
Net increase (decrease) in cash and cash equivalents 3,780 (195)
Cash and cash equivalents, beginning of period 616 432
Cash and cash equivalents, end of period 4,396 237
Supplemental disclosure of cash flow information:    
Cash paid for interest, capitalized to mineral property 35   
Supplemental disclosure of non-cash activities:    
Capitalized non-cash interest 145   
Loan to noncontrolling interest    49
Issuance of stock to noncontrolling interest 77 41
Transfer of contra-noncontrolling interest to noncontrolling interest upon earn-in    531
Disproportionate share entry from noncontrolling interest to additional paid-in-capital upon earn-in    $ 2,983